public class Demo7 {
    public static void main(String[] args) throws InterruptedException {
        Object locker1 = new Object();
        Object locker2 = new Object();
        Object locker3 = new Object();

        Thread t1 = new Thread(()->{
            synchronized (locker1){
                try {
                    locker1.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("A");
            }
        });

        Thread t2 = new Thread(()->{
            synchronized (locker2){
                try {
                    locker2.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("B");
                synchronized (locker1){
                    locker1.notify();
                }
            }
        });

        Thread t3 = new Thread(()->{
            synchronized (locker3){
                try {
                    locker3.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("C");
                synchronized (locker2){
                    locker2.notify();
                }
            }
        });
        t1.start();
        t2.start();
        t3.start();
        Thread.sleep(1000);
        synchronized (locker3){
            locker3.notify();
        }
    }
}
